TurboGoKart Posted December 31, 2010 Report Share Posted December 31, 2010 Never seen this happen before, but from what I've heard it's not common. Did a 2-3 pull, heard some nasty noises and ended up finding part of my crank pulley on the side of the road! http://i66.photobucket.com/albums/h244/turbogokart/b6434357.jpg Anyone ever seen this? Comments? Any pulley options not have the rubber in the middle so this won't happen again? Quote Link to comment Share on other sites More sharing options...
Mattsv8 Posted December 31, 2010 Report Share Posted December 31, 2010 they do that often from what ive red mostly seems on the dyno. get a ati and never worrie again and while ur at it pin the crank. i think too in one of the 12 mags i subscribe too they were dynoing a ls1 or 3 and same thing broke at about 5500-6000 Quote Link to comment Share on other sites More sharing options...
AJ Posted December 31, 2010 Report Share Posted December 31, 2010 its common. chevy high performance even had it happen to them on a ls1 they built. Quote Link to comment Share on other sites More sharing options...
Buckeye1647545503 Posted December 31, 2010 Report Share Posted December 31, 2010 Horsepower on powerblock had it happen as well. Quote Link to comment Share on other sites More sharing options...
TurboGoKart Posted December 31, 2010 Author Report Share Posted December 31, 2010 Weird. I didn't realize it was that common. Can you still pin the crank with an ATI? My buddy had one (don't remember the brand) and Tom came over to pin it but couldn't because there wasn't enough material. Quote Link to comment Share on other sites More sharing options...
Mattsv8 Posted December 31, 2010 Report Share Posted December 31, 2010 u can with ati cause thats what most use to drive superchargers. duno about other brands. Quote Link to comment Share on other sites More sharing options...
TurboGoKart Posted December 31, 2010 Author Report Share Posted December 31, 2010 Ah gotcha. Thanks! Freaked the piss outta me when I heard all this clanking and saw some sparks lol. Quote Link to comment Share on other sites More sharing options...
evil8 Posted December 31, 2010 Report Share Posted December 31, 2010 Don't bother pinning it unless you are running a blower. Quote Link to comment Share on other sites More sharing options...
MrMeanGreen Posted December 31, 2010 Report Share Posted December 31, 2010 Meh, I ran mine fine for years and finally upgraded to the ATI. Not pinned, either Quote Link to comment Share on other sites More sharing options...
AJ Posted December 31, 2010 Report Share Posted December 31, 2010 Don't bother pinning it unless you are running a blower. really because i have seen the balancer spin off the crank with a heads/cam ls2. Quote Link to comment Share on other sites More sharing options...
Mattsv8 Posted December 31, 2010 Report Share Posted December 31, 2010 id pin any crank dampner evan if it is only driving ur p/s a/c wp and alt. very cheap ins. and not hard to do. i bet you the same people who say dont pin it will change their advice once theres is spinning on the crank and they have to buy a new one. crank Quote Link to comment Share on other sites More sharing options...
Mattsv8 Posted December 31, 2010 Report Share Posted December 31, 2010 oh and somone on here should have a pin kit you can use. all ud have to get is the roll pin Quote Link to comment Share on other sites More sharing options...
evil8 Posted December 31, 2010 Report Share Posted December 31, 2010 really because i have seen the balancer spin off the crank with a heads/cam ls2. The pin isn't going to retain the balancer, the balancer bolt is supposed to do that job. Quote Link to comment Share on other sites More sharing options...
TurboGoKart Posted December 31, 2010 Author Report Share Posted December 31, 2010 The pin isn't going to retain the balancer, the balancer bolt is supposed to do that job. The hell it wont! You try shearing a pin sideways like that. The bolt is about .02 cents in insurance so the pulley won't fall off. Here's what's left of the crank pulley on the car. I missed it the first time because the belt grooves were deceiving. Those grooves are actually from the 30 seconds the car was running after I heard something fall off. Had I felt belt tension right away I would have known something was goofy. Luckily nothing was hurt/broken other than the crank pulley. All the other pulleys still spin freely. http://i66.photobucket.com/albums/h244/turbogokart/39a65c57.jpg Quote Link to comment Share on other sites More sharing options...
evil8 Posted December 31, 2010 Report Share Posted December 31, 2010 The hell it wont! You try shearing a pin sideways like that. The bolt is about .02 cents in insurance so the pulley won't fall off. Here's what's left of the crank pulley on the car. I missed it the first time because the belt grooves were deceiving. Those grooves are actually from the 30 seconds the car was running after I heard something fall off. Had I felt belt tension right away I would have known something was goofy. Luckily nothing was hurt/broken other than the crank pulley. All the other pulleys still spin freely. ] Do you actually understand how these are pinned? The pins go parallel to the crank, not perpendicular. The bolt retains the balancer. Quote Link to comment Share on other sites More sharing options...
TurboGoKart Posted December 31, 2010 Author Report Share Posted December 31, 2010 What I'm saying is IMO, pinning the crank will provide you with more "security" than the bolt will. Your pulley *could* still spin with just the bolt on there. I've yet to see someone spin the pulley on the crank with it pinned. Quote Link to comment Share on other sites More sharing options...
AJ Posted December 31, 2010 Report Share Posted December 31, 2010 The pin isn't going to retain the balancer, the balancer bolt is supposed to do that job. i understand that but it doesn't always. i have seen it first hand. the pin keeps the balancer from spinning on the crank shaft and loosing the balancer bolt. Quote Link to comment Share on other sites More sharing options...
evil8 Posted December 31, 2010 Report Share Posted December 31, 2010 i understand that but it doesn't always. i have seen it first hand. the pin keeps the balancer from spinning on the crank shaft and loosing the balancer bolt. I will assume you mean loosening the balancer bolt, and I will agree with you on principle. The only time I have seen a balancer come off was a boosted LS1 RX7 that had reused one of the factory crank bolts. Thats a definite bad idea. That should be LSx tech tip #1: If for any reason you remove the crank bolt, do not reuse it. A new one can be purchased for 8 dollars. Quote Link to comment Share on other sites More sharing options...
TurboGoKart Posted December 31, 2010 Author Report Share Posted December 31, 2010 ^^Agreed!! Quote Link to comment Share on other sites More sharing options...
Mallard Posted December 31, 2010 Report Share Posted December 31, 2010 Dang, that happened on my friends STi too. Quote Link to comment Share on other sites More sharing options...
Cordell Posted December 31, 2010 Report Share Posted December 31, 2010 Seen this shit before, just had a Vette in the shop recently with one coming apart just like that, it threw the belt before it came all the way apart. Problem is anything made out of rubber gets old and high RPMs don't work, I've also seen the crank bolts come loose and pinning the balancer fixes that. If the balancer just starts to spin it will loosen the bolt. Quote Link to comment Share on other sites More sharing options...
GSXRAntwon Posted January 1, 2011 Report Share Posted January 1, 2011 really because i have seen the balancer spin off the crank with a heads/cam ls2. Mine did lol Quote Link to comment Share on other sites More sharing options...
GSXRAntwon Posted January 1, 2011 Report Share Posted January 1, 2011 I will assume you mean loosening the balancer bolt, and I will agree with you on principle. The only time I have seen a balancer come off was a boosted LS1 RX7 that had reused one of the factory crank bolts. Thats a definite bad idea. That should be LSx tech tip #1: If for any reason you remove the crank bolt, do not reuse it. A new one can be purchased for 8 dollars. Fuxk the factory crap, go with an ARP and a lot of red locktite torqued to spec and it'll never come off. I had a 150 shot on my ls2 and after I pinned the crank I never had a problem with the balancer coming off or bolt backing out. The only reason the bolt spins loose on a stock setup is cause the pulley spins on the crank and loosens the bolt. If the pin and an ARP will hold a shot of nitrous and the instant torque that it makes, it'll deff hold the gradual power increase of an NA or blower car. Quote Link to comment Share on other sites More sharing options...
evil8 Posted January 1, 2011 Report Share Posted January 1, 2011 . If the pin and an ARP will hold a shot of nitrous and the instant torque that it makes, it'll deff hold the gradual power increase of an NA or blower car. That made me laugh. The torque of a nitrous shot has nothing to do with the balancer, now the input shaft of the tranny might feel that way. Crank pinning is mostly used for blower cars. They create the most load on the crank pulley, as you are spinning another item that increases in load with rpm. The accessory drive doesn't create a huge load, which is why GM doesn't pin the cranks. Quote Link to comment Share on other sites More sharing options...
AJ Posted January 1, 2011 Report Share Posted January 1, 2011 That made me laugh. The torque of a nitrous shot has nothing to do with the balancer, now the input shaft of the tranny might feel that way. Crank pinning is mostly used for blower cars. They create the most load on the crank pulley, as you are spinning another item that increases in load with rpm. The accessory drive doesn't create a huge load, which is why GM doesn't pin the cranks. you are proving yourself to know very little about cars. you continue to argue with out backing anything up while there is plenty of cases where the balancer will spin and back out the bolt without pinning. now while on a stock car the pin kit isn't necessary but in high horse engine its a must. Quote Link to comment Share on other sites More sharing options...
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